Automatic gun



Nov. 27, 1923.

G. o. FISHER AUTOMAT I C GUN Filed Nov. 5, 1920 2 Sheets-Sheet l Nov. 27, 1923. @mam -G. O. FISHER AUTOMAT I C GUN Filed Nov. 5, 1920 2 sheets-sheet 2 Patented Nov. 27, 1923.

UNITED STATES PATENT oFFlcE.

GEORGE om mmm, or nnooxLY/N, NEW Yoan; BmsIE n. FISHER ADMINISTRA- :mIx or sm GEORGE owEN rIsHEn, nEcEAsEn, AssIGNoa 'ro EnssIE M. FISHER.

kor Bnoonnr, Imw Ironic.K

' Auron'rrc GUN. Application nea november s, 192e. serial m. 421,917.

To all 'wlwm it concern.'

Bc it known that I, GEORGE OWEN FISHER, a citizen of the United States, residirg at Brooklyn, in the county of Kings and tate of -New York, have invented certain new and useful Improvements in Automatic Guns, of which the following is a specification.

- This invention relates to firearms of the automatic or machine gun type.

The objects of the invention are to'provide simple, practical and reliable mechanism for converting such guns at will from automatic to single shot operation.

A special object is to make this contro mechanism applicable to an approved and tried rapid fire gun which is now in use.,

In the drawin s accompanying and forming a part of thls specication, have dis- 2@ closed the invention as applied to the type of gun referred to, but wish it understood that the invention is not limited to this particular use or to the particular structure shown, as will be clear from the scope of the following specication and claims.

vFigure 1 in the drawings referred to, is a side elevation of an automatic rifle, having the invention incorporated in and forming a part thereof.

Figure -2 is an enlarged broken sectional and side elevation of the breech and trigger mechanism, illustrating the parts as set for automatic operation, and showing the automatic magazine trip as about to operate the @5 mechanism for disconnecting the trigger from the scar.

Figure 3 is a similar view, connector as operated on the discharge of the last cartridge from the magazine to uncouple w the trigger from the sear. ln both Figures 2 and 3 the positioning bolt forming a part of my invention is shown in its inoperative position.

Fi re 4 is a view similar to Figure 2,

e5 but s owing the positioning bolt or change device as turned to position the connector for single fire operation. In this view, the trigger is shown as having been pulled far enough to almost release the sear from the bolt, and the connector as standing ready to clear the Sear immediately the lbolt is released.

Figure 5 is a broken side elevation of ward] showing the taken on substantially the plane of line 7-7 of Figure 5, with the turn bolt standing in the inoperative dotted line position shown in that view.

In the construction illustrated, the bolt of the gun is shown in a general way at 10, it

lng provided as customary with a notch 11 for the heel of the sear 12. This sear is shown as pivoted at 13 and as acted on by a spring 14 which tends to thrust it into holding engagement with the bolt.

The trigger of the gun is indicated at 15, and is shown as pivoted at 16. The finger portion of the tri ger is thrust downward into the position s own in full lines in Figure 2 by a spring 17 acting on the forwardly extended end of the trigger body.

The trigger is coupled to the sear by a connector pivoted at 18 on the rearward portion of the trigger and having a rearextending arm 19 for engagement with t e forward end of the scar and a forwardly and upwardly extending arm 2O for engagement by a trip lever. The forward arm of this connector is acted on by a spring 2l which rocks the connector rearwardly, so as to position the arm 19 beneath the toe of the sear.

The trip lever is illustrated in the form of a yoke 22 surrounding the upper body portion of the trigger and pivotally sup orted on the pivot pin 16 of the trigger. lug or shoulder 23 on the rearward end of the trip lever overstands the arm 20 of the connector and at its forward end the trip lever is provided with an extension 24 for engagement bya trip lug 25 carried by the springpressed cartridge feed plunger 26 of the magazine 27.

The described arrangement and proportion of parts is such that when the trigger is pulled and held back, as indicated in the dotted lines in Figure 2, the sear will be retracted from enga ement with the bolt, and the gun will then re automatically, the bolt reciprocating under the alternate impulses of the expanding gases and the return spring to eject the empty shells and to carry the fresh cartridges from the magazineintothe barrel and fire them. This automatic tiring, of course, is under absolute control of the trigger because if at any time pressure on the trigger is released, the sear will immediately snap back into holding engagement with the bolt. As the last cartridge leaves the magazine, the trip lug 25) of the magazine feed engages the forward extension'of the trip lever, rocking the forward end of the same upwardly and the rearward end of the same downwardly, as in Figure 3, so as to rock the connector forwardly and thereby disengage the arm 19 of the same from holding engagement with the sear. Th1s frees the Sear of the trigger control and causes 1t to snap into holding engagement with the bolt as soon as the last cartridge is red.

The present invention may be said to consist in positioning the trip lever at an intermediate point between the two extremes shown in Figures 2 and 3 so as to cause said trip lever, when the trigger is actuated, to position the connector so that said connector after releasing the scar will immediately clear the same, and permit the sear to spring back into holding engagement with the bolt. lThis intermediate position I have illustrated in Figure 4, and the means for accomplishing this end I have shown in the form of a turn bolt 28 rotatably supported beneath the forward eX- tension of the trip lever,l and having a shoulder which, when the bolt is turned as in Figure 4, will lift the forward end of the trip lever to a position where the rearward end of the, lever will slightly depress the .-fforward end of the connector when the trigger is pulled. This in effect shortens the hold of the connector on the sear so that immediately after the sear is released from the bolt, the point of the connector will slide free of the point of the sear so as to release the sear and permit it to immediately Snap back into engagement with the bolt on its recoil stroke or into the position l tions` described.

shown in Figure 3.

The turn boltwhich constitutes in eilt'ect a change device is provided with a flat part 29 on one side thereof which, when the bolt stands in the position shown in Figures 2 and 3, allows clearance for the forward end of the trip lever,'thereby making the turn bolt ineffective.

The turn bolt is actuated, in the illustration, by a lever 30 on the outer end thereof, which carries a spring-pressed pin 31 for restraining the bolt in either of the posi- The invention, it will be seen, provides a Simple and at the same time a dependable device which may be readily applied to guns of the type shown and Without necessitatin any material yalterations or changes. One of the special advantages of the inl. In a gun of the character described,

a bolt, `a sear for cooperation therewith, aV

trigger, a connector pivotally mounted on the trigger and engageable at one end with the sear, a trip lever for engaging and positioning the connector, and means Ifor positioning said trip lever to govern the period of engagement of said connector with the sear during the operation of said trig r.

2. In a gun of the character describe a trigger, a sear, a connector pivotall mounted on the trigger and traveling bodlly therewith, a trip lever pivoted concentrically with respect to the trigger and having a portion to engage and shift the connector about its pivotal point thereby governing the period of engagement of said connector with the scar during the operation of said trigger.

3. In a gun of the character described,`

a trigger a scar, a connector pivotally mounted on the trigger and traveling bodily therewith, a trip lever pivoted concentrically with respect to the trigger and having a portion to engage and shift the connector during. the trigger movement, and means for positioning said lever to cause the connector to actuate and to then immediately clear the Sear, the said positioning means including a turn bolt standing in the plane of the trip lever and having a flattened side ren,-l

dering said bolt inoperative when turned toward the trip lever.

4. In a gun of the character described, a pivoted trigger, a pivoted connector carried thereby, a bolt, a sear for holding the same and arranged for engagement by the connector, a trip lever ivoted concentrically with respect to the trigger and engaging at one end the connector for positioning the same with respect to the Sear, and means for engagement with the opposite end of said trip lever to enable continuous engagement of the connector with the sear or to ect disengagement of the connector from the sear after each actuation thereof.

5. In a lgun of the character described, a bolt, a sear for hold-ing the same, a trigger, a connectorfinterposed between the trigger and scar, a trip lever controlling the position of said connector, a magazine including a movable `stop for automatwally actuating the trip lever, and means for itioning said trip lever independently ofposid automatic stop.

6. In a gun of the character described, a bolt, a sear for holding the same, a trigger, a connector interposed between the trigger and sear, a ltrip lever contolling the position of saidA connector, a magazine including a movable stop for automatically actuating the trip lever,`and means for positioning said triplever. independently of said automatic stop, and including a turn bolt having relatively high and low portions adapted to be positionedV in line with a part of the trip lever.

7. In a gun of the character described, a. bolt, a Sear for holding the same, a pivoted trigger` a connector pivotally carried by said trigger, a trip lever mounted on the trigger pivot and having one end overstanding a part of the connector and its opposite. end extending beyond the trigger, and a positioning member beneath said extended end and having a shoulder adapted to engage the same.

8. In a gun of the character described, a bolt, a scar for holding the same, a. pivoted trigger, a connector pivotally carried by said trigger, a trip lever mounted on the trigger pivot and having one end overstanding a part of the connector and its opposite end extending beyond the trigger, and a positioning member beneath said extended end and having a shoulder adapted to engage the same, said positioning member being 1n the form of a rotatable bolt having one of its sides flattened to stand free of the extended end of 'the trip lever.

9. In a gun of the character described, a bolt, a sear for holding the same, a. pivoted trigger, a connector pivotally carried by said trigger, a trip lever mounted on the trigger pivot and having one end overstand-ing a part of the connector and its opposite end extending beyond the trigger, a positioning member beneath said extended end and having a shoulder adapted to engage the same, said positioning member being in the form of a rotatable bolt having one of its sides fiattened to stand free ofP1 the extended end of the trip lever, and means automatically actuated in the .operation of the gun to rock the trip lever independently of the position-ing means aforesaid.

In testimony whereof I affix my signature.

GEORGE OWEN FISHER. 

